Question

multiple choice question

the rectus abdominis and the sartorius are examples of ________ muscles.

pennate
fusiform
parallel
triangular

Explanation:

Identify muscle fiber arrangements

We analyze the structural classification of skeletal muscles based on fiber direction. Skeletal Muscle Shapes are classified by how fascicles align relative to the tendon.

Analyze rectus abdominis and sartorius

The rectus abdominis and sartorius have fascicles running parallel to the long axis of the muscle. This arrangement characterizes parallel muscles.

Compare with other options

• Pennate Muscle Structure involves fibers inserting obliquely into a central tendon, resembling a feather.
• Fusiform Muscle shapes are thick in the middle and tapered at each end.
• Triangular Muscle Structure features a broad origin converging to a narrow insertion.

Therefore, parallel is the correct classification.

Answer:

• pennate
• fusiform
• parallel (Correct answer)
• triangular